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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fde7c36c1894c588797b79ebadc403bd3cba7f2c1e491059087b03231c5455' 
  AND token = 'AeITGxiyznaSon8UTUvzygq1f77lS94DsRwQP7R5tiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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