SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05ae3263002a38b48e308bdcc4c278b56db064bae93855be146dd48fd7ee665' 
  AND token = 'z8XY/nbRfZSKBIaTXlfTmB+jGrzZAvJHP8lAPcYwGFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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