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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413d3c8fe963dc9b11ae9853e03800b7e584d9a35dd1c5985a55b841ab9c387a' 
  AND token = 'ZTuRcbv2OPZOpxwDE+iGs2C75mk0JUiwEFhvVP05wi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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