SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980825fb0d3e35b731f69ca425e344a56315aaf0f28b5597d84d3604c79c837d' 
  AND token = 'gkS1YCTe1YnGZuf0BgGDGlnGoil0Jfd7nAvq35K/w2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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