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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9296061ac248f57b4fddf60e01bc0dc2fb7217766d0db523fd968261afd3d373' 
  AND token = 'VJaN2d+hsZ7tXagELmy7HFqHZiN8OV9G5L5H4qPmfe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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