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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3e4ba9614cdbfd921507549b8c749881794a3ba0220fd9d6cdc2b3cbe02498' 
  AND token = 'Nct7zVHkMLt5SQs3QV3zM9rIloUa7yaI6PkaZCh9b1M=' 
  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"
    }
  }
}