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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21b2201e61a564552ccb40a8bee93d2f21263ed154757e6adf3ab8bdf583491' 
  AND token = 'q0j8jhQF4j2dp6mmJoZFVWunFFFBZlanpBSCIv8jxeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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