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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ace9fa171fbb2954e85392f0e43dcc7e26078f66aad0ed4de9c21bd88579857' 
  AND token = 'lOz5cBntY2XiAvRPjhPGzr8DtkGo8olTsctbwIgLk9U=' 
  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"
    }
  }
}