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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b222e7c1519f512b3e03a1bdd6ed86475f50fff1b57aa020c8db44446bd8f1b4' 
  AND token = '9etrPcQiy62mOe5LNLXDF261ZG3C8yN/kpUrmKnJlvY=' 
  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"
    }
  }
}