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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0980b7d7e25f76434b7268c73c49e83a0818ee3f0862a99c1b70b3b49ffb4e5' 
  AND token = 'A3KzEj74jtqZOBC2ZUjuhzEtHUNNWPBQjHkA/DQQkwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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