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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5413c27af3a27d38ae037a780bc258051752a2b888fd2978a8c43ab1deb7b794' 
  AND token = 'd3RKX7Lkw80oNj1e7EKIoEBINAfP53siCFYDFNu7wbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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