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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc260a0a23a5afe09608d693f2e05be07de01a959729ccb53617bb562bd56e0' 
  AND token = '8pYQKVDEdKtaaXSOu5FOUht/wSh62RNJPQHI2ueG8bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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