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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c91a4dbf09de6ef76096d5761293ce94a90ba04bc565101ca764045db4fa865' 
  AND token = '4L0eRX/GtZtYRo18KakxUifg8IIy1SVNPCwlDtcRYXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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