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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ecf90a8f0eac48971bfb9abec697a8716a4be343a240c926fa0013d20b2b0b8' 
  AND token = 'pobuewH4G28U+jIRnamP8cARETwP9TyHz76UHPFVCAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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