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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1c6396c18e83868efb29853d8608fb66d6d8eeb338c3aefde372b2a6593e41' 
  AND token = '1AC+0uuVYa0hVquyrCVbs5tQ0rR/8+4c4gvayjwG3kw=' 
  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"
    }
  }
}