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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6382b4148dc8ea8aa63507beb67cedf40a057fa4e353521d3a69b34ebecc4d3c' 
  AND token = 'XXO6F4NCpHz1DU7ycgtronIUnDL1MTzYp2UzNQhfvHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}