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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df94caf1fbf28edcdd4ca33d40fd2dc32be27aa91cf31d46f13ba4deedd756af' 
  AND token = 'FE7tIMk1X5FBlsUzc8rmNXHAcuTby5Tog6FqoAv7hAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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