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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b737a6b2c72e4c6c57343740af65cab03bda6bc1ce756374e0acbd8b0ff0e30' 
  AND token = '1jj06aE/8CKE5OVWf5VedoAd+fR7LqgLiBsaUX4GBBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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