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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7aef595ace263f9f38ca15ef796c269a7351b5b3a19ed9d79ad8d89e334edd' 
  AND token = 'k1I9ALFFD0kg5oNA1KcTE2K/yAIYF2wcutGYOohtQF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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