SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18864bca9ff8cf6a68e2c3f220fe02874f265466833b0d3feb32847aad8109c8' 
  AND token = 'wfVxhYE3ggaTFmhRK7/KzZzAv7PZeoLGRtHCsPk7iiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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