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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1a28f23222c3ab18c737c41cd707adf697fc335ff57b09082b776af0fd7238' 
  AND token = 'v6xAy75la5X6F6m76H8+d1H90WuYb9uDq/i7x0VBnnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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