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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf15b55d288fe7ea925e1fa9cf7a0c3f89a9114bab21fa1f8202dd4c2c5ed952' 
  AND token = 'xebB0jxJ5W85GX+pZUKBwEKpzAoiOxkxzZCgTmcfKHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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