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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7e6a95f90f252f2b167e98fbdc75d3964fbe60f0847d6d30af80fae366fe61' 
  AND token = 'a0+L0q6Jnds+3M/IoHH0NpgNAVf5z8anFitK4X8h6o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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