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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b73c2b9a393d6e2d1f4058ef144b9746524bac6b6d76d9b76e9b9c0f58b9311' 
  AND token = '9uayznfMlagYij9WHIBahjA0yZzlSPrtWqSGm5tOg3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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