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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f6be3b1dcd6a1cb86b7f0aa80e5fdb4ad925d33d15d573b4d1ce59e9e348e8' 
  AND token = 'kWtPU/4ej2+ACsJr1OSPsGIHonXSrzs4Z/e51XabtK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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