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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793e344fe87008cc1ac26b5701f62418c5fa6349cf80a1a9f20a64df61d5a4eb' 
  AND token = 'kfNkeUW+5QT7k56HYvmJA51kdvdaYeGzc0vB7cb4dRg=' 
  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"
    }
  }
}