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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1300d91788cb6657df5c94cf6c993468bface7d5dcd95e1a0087506b68214bc5' 
  AND token = '1nSUbopxK8deTbUK8JkybDLCWG+JpkEa8Ty7d56u/cw=' 
  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"
    }
  }
}