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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09338418c5d0fc8af72041aef118ce042a6896398b128144c8ab697b69b3372' 
  AND token = 'y59V8GdlZ8cbxiACbC2m8UKE/OqBWJd2INqGt0JKy3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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