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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30398400f0000db4704c0278058d2797bacc05dfc933d7b3dac8b5bc67aed9a' 
  AND token = 'AAIyqiB1HfhAy/7dlVorcN2tLjLe+Unl6UxaSd7Qgdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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