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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fddefadb035afd09de6d0280b56fc5df330c76e0a0472f3ab7b7d8d3b693cfb' 
  AND token = 'N5i2JFqELOwMF86NloIYJHU9XXEh3Krf0C74mKzHqSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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