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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '080df7341a11fe481ebe04a93f40cbd2d68d3e2e10a7f1f5022d0a31849d8aa5' 
  AND token = '/O2VpdAvelb/r3LW4vJRE67i5IPm+NOouG8eHaURQUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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