SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82989a1d998b5d5f9f49d004d4b560bc5b4f96a3d582a3675c3729b24d4fc23c' 
  AND token = 'uUzmGAU0DpFVBXOf7bDQ6Bp5LMgJ88kysMfbh5z3qow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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