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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1d35a750b6538b18cf2abfe9304159aa41ac9cb60a4a9197596b6e9ef0c064' 
  AND token = 'CxiVdM1UWGcahfjtIhBecWbaCxsHnbg3LyK8mY1T7hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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