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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bba8c7f56ceef2294b5b7c8bf70394bae100891c9984d45f97614a1d95c9de' 
  AND token = 'IObgCW5WHxvLwkxqeHFmzHa4u/xHiSeL1BjIGeobvTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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