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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21123b562b36755a77775fee662e8ebc1bbf84e5c7603944dae0968ce72dfe03' 
  AND token = '94cUEFG1ZN6GKrn7iEVt28GyyUNWAvKkIT3K3wTe8wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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