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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae75843f8d4bee2f140126303e12f87bf1c31a7bef4c8475daf91ed4677c24f' 
  AND token = 'H6m3ywx/OtY0kUdjb6CHdi20hWO/B1sNEcM2pqm0Bgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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