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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991116773286e700d41a40cf788c222d3f183149b22246f102ae35adca5ce75c' 
  AND token = 'pbkg4wL0dNky7Fd0X81aI63TOeU7OusMdhP2zOAZLDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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