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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770abca1a6c3806b00311a56e6c24eba8df0ec6d4ad624de4b8d8752f4bd020f' 
  AND token = '3rqx0+zW8Awe6I9qSLhK0ZNdmQ2/GfJH/0RysIAEENA=' 
  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"
    }
  }
}