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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ce1ec51f44390bb7fb7c5e9a40aa7f7b714abbe81b4c50b3260651d2d44751' 
  AND token = 'anoiyy0Tp0v+ii+PgRGZw8YNi0iopCFZUlDLQve0hEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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