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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5902fc04f0ab8b7ce944d50728243776694f4f5dc0a61f800ab8de5531aecd95' 
  AND token = '7Q7b0yTtKfHquBaSXnjdp2/+k/j6GguCQRHdSZGWNY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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