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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110f1a381ffe0b29c0e2910bf76e9ddee8bdfd6b6eeec93f1ca19e5e45859772' 
  AND token = '5CJ+Js3rtLV4GxBNrTIU4yi+4glSGii6d3KybuPgt2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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