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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3eca634838e8959f9451ae03a5ac0c1ebc3a6b2678f6d8b6ca74541d7c70828' 
  AND token = 'lLioAkpDBeIzdxkAVhK9tD/VpDp6jLkKXMq4k0vkae4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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