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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502011fb8c27e9dbbf59c99b177e7a7005aba11db1b24df1f4c6e94e174f763c' 
  AND token = 'YCq8CwkL05R9nlZ1zB71gJSpexshgCet6eQ03gEAYjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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