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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51fed6695c98f251b524448970c5136af3d81c76b297dfad1b43b0dd1b73cf9' 
  AND token = 'Vs2G8r9CP0ud6dgppVuI1cRrzuvwAHeIy1BPW0pZ3ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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