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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36733de12b7837e23a80abe9975304fbdb45bf7f014f6bd0a39ea5f9d959ee76' 
  AND token = '14mOs11n6oxyuIdJ96t+X0Fb72cMNNxdRQ9fwvxGK98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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