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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433b3987dca1d6340784de2f94e945fdbb58891d6cab316b63da0b6cdd8bb9ce' 
  AND token = 'RPg0AAokSTuNzuYdSdSplwQNR6APeMUy0DBrVrLk4cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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