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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d1f4a150909c5bc29f7ff9abe6704cf381e00ab712c4ba8f0567e2bc20e6d2' 
  AND token = 'QHL7u8Vslf3iPFa3jL8LXG3VIo0w1To8PyhElmWFqL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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