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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd75173a5cdf2b1c37d59e40990933510e48a05d9bfdc6be86663a8e8778211c' 
  AND token = 'awqWTJFLPzUwVkJ7CJpgbUHtxwte3bvgD9hHitdOJC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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