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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ef7b9ea7bf473d2eff44806c9d40065e604213fa79e339e0acdf4300898021' 
  AND token = 'qbmiPPWSh9El26ok686Ia+hgY7UwlgeuZigoRM2R7rA=' 
  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"
    }
  }
}