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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86052342521a2fd4e46c29484b574921d3cac8a5a125b02a5f495c92f99585d9' 
  AND token = '5YLWCZvOz0n+bmOlE8RgLR9myeZMD+kY3r/bnWXy2Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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