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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ccd2e7c8d8c4b2ba7a48bdcd3130615073c76d39aa19042562e17b9527c771' 
  AND token = 'w6Uwhqu+Ivu8asY9e1Nqc7KgUV/9srvy2uqlVxBBr9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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