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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cea5a91efc4a080c333e2a8555f7043563e69a933cd87bd1e0b438562b367da' 
  AND token = 'dNZBSPDHtpOvpX6BpmNfeapxCn/DdS3+K407m2S7+Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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