Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2eaa13b0c3edaddffd3c92d3c16bc4ff9a5d227d4febf7feb1687a9730aa308' 
  AND token = 'SYhnenMxipSLy0iCBT8BPaj4CewidTWYKLU5HfUfx0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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