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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2467dc4cfa38f432418c60c47b9c4aa918b88d0f712a40cb11d0bbc9280566dd' 
  AND token = 'PZUKPx4KP2t+AtoT0FMf5525fOZo/C27Z9xsucRflx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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