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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c16ccde0a0374ffbacca101ba5e88255b7024c700f6eb21fceae170cb8385f' 
  AND token = '54psdNYSVPlyk8Vd+jH/gR23JQcG3jryNpFUmFsUS5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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