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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94168c9bbc8f5fd1fcbfbc7e8d0da37b0b6f9d764d7fabe4e919ce424d042610' 
  AND token = 'XDC876Yd2gCEfy63100E2JdoKRRaM3S6GL43LiQVriE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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